Garden Care Guide

Japanese Snowball Care

Viburnum plicatum

It has a very elegant, architectural appearance with its horizontal, layered branch structure. It prefers moist, well-drained and slightly acidic soil and full sun or light shade. It needs regular summer watering in hot climates.

Hardy · -25 °C / -13 °F

Monthly care calendar

Timings are for a temperate Northern Hemisphere climate. In warmer areas tasks start earlier, in colder areas later; in the Southern Hemisphere shift them by six months.

January
  • Watering: Not required; the plant is dormant and winter rains are sufficient.
  • Pruning: To preserve its natural form, pruning should be kept to a minimum. This is only the best time to cut broken, dead or clearly misdirected branches.
February
  • Fertilizing: At the end of the month, before new growth starts, some compost or a slow-release fertilizer for acid-loving plants can be applied to the soil. Do not overfeed.
  • Pruning: Remove branches damaged in winter. Wait for the main pruning.
  • General care: The plant is preparing to wake up.
March
  • Watering: Water a newly planted specimen more often than established plants during its first year, as its root system is still shallow.
  • Fertilizing: Apply a balanced fertilizer or well-rotted organic fertilizer once when it wakes from dormancy.
  • Pruning: Not done; wait for it to flower.
  • Plant protection: Check the newly emerging fresh leaves for aphids.
  • General care: Good time for planting and transplanting.
  • Pests & diseases: Iron chlorosis (yellowing of the leaves) can occur in calcareous (alkaline) soils.
April
  • Watering: If there is no rainfall, water every 15 days. Water newly planted plants more often than established plants during the first year; the root system is still shallow.
  • Plant protection: If symptoms spread and treatment is needed, consult a licensed plant-protection supplier or an agronomist. Plant protection products are regulated; follow local rules.
  • General care: Suitable period for planting and transplanting. Flowering begins.
  • Pests & diseases: Look for aphids (green or black clusters of small insects) on fresh shoot tips. If there are only a few, you can knock them off with a strong jet of water.
May
  • Watering: If there is no rainfall, water once a week. Water newly planted plants more often than established plants during the first year; the root system is still shallow.
  • Pruning: Right after flowering ends, you can lightly prune only branches that spoil the shape or grow excessively long. It generally does not need pruning.
  • Plant protection: If symptoms spread and treatment is needed, consult a licensed plant-protection supplier or an agronomist. Plant protection products are regulated; follow local rules.
  • General care: Suitable period for planting and transplanting. Flowering continues. Apply mulch 5-7 cm thick over the root zone; it conserves soil moisture and suppresses weeds. Do not press mulch against the stem.
  • Pests & diseases: If you see black spots with yellow halos on the leaves (black spot), collect the diseased leaves and remove them from the garden; the disease overwinters in fallen leaves. Check the fresh shoot tips for aphids (small clusters of green or black insects). If there are few, you can knock them off with a strong spray of water.
June
  • Watering: Water deeply twice a week; prefer infrequent and generous watering over small and frequent. Water around the roots to a depth of 15-20 cm.
  • Pruning: Prune as soon as flowering ends. Next year's flower buds form over the summer; late pruning reduces flowering. Do light thinning right after flowering ends. Avoid heavy pruning; the natural horizontal growth form is spoiled. Always remove dead branches.
  • Plant protection: If symptoms spread and treatment is needed, consult a licensed plant-protection supplier or an agronomist. Plant protection products are regulated; follow local rules.
  • General care: The fruits continue to grow.
  • Pests & diseases: If you see black spots with yellow halos on the leaves (black spot), collect the diseased leaves and remove them from the garden; the disease overwinters in fallen leaves. Check the fresh shoot tips for aphids (small clusters of green or black insects). If there are few, you can knock them off with a strong spray of water.
July
  • Watering: Water deeply twice a week; prefer infrequent and generous watering over small and frequent. Water around the roots to a depth of 15-20 cm.
  • General care: Keep it in a position sheltered from midday sun; scorching at the leaf edges is a sign of burn.
August
  • Watering: Water deeply twice a week; prefer infrequent and generous watering over small and frequent. Water around the roots to a depth of 15-20 cm.
  • General care: The fruits turn from red to black.
  • Pests & diseases: Check the general health of the plant.
September
  • Watering: If there is no rainfall, water once a week.
  • Pruning: Not done. Let the plant show its natural form.
  • Plant protection: If symptoms spread and treatment is needed, consult a licensed plant-protection supplier or an agronomist. Plant protection products are regulated; follow local rules.
  • General care: The plant is preparing for autumn colour. It is decorative with its red-black fruits and leaves that slowly change colour. It is a good month to plant new young trees.
  • Pests & diseases: If you see black spots with yellow halos on the leaves (black spot), collect the diseased leaves and remove them from the garden; the disease overwinters in fallen leaves.
October
  • Watering: If there is no rainfall, water every 15 days. Water newly planted plants more often than established plants during the first year; the root system is still shallow.
  • General care: Good time for planting and transplanting.
November
  • Watering: Water a newly planted specimen more often than established plants during its first year, as its root system is still shallow.
  • Pruning: After the leaves have completely fallen, pruning can be planned.
  • General care: Good time for planting and transplanting. Collect fallen leaves; many disease agents and pests overwinter under them.
December
  • Pruning: This is the most suitable period for pruning.
  • General care: The plant is fully dormant. Its layered branch structure looks interesting even in winter.

The care advice on this page is general and for information only; it is not professional advice. Plant age, soil and your garden’s microclimate can change the outcome. Plant protection products are mentioned only as general information; they are regulated, and the choice, dose and timing must be decided by a qualified professional under local rules. Consult a landscape architect or agronomist before applying.

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